Today's award goes to a larcenous ATM service technician in New York.
According to NBC New York, Gene Carlo Pena worked at a company that serviced ATMs in Manhattan. In hopes to avoid detection, authorities believe Pena put fake bills in the ATMs after helping himself to a substantial amount of real cash. However, the counterfeit currency was easily detected by the cash machines and customers (perhaps due to the fact that they were blank on one side).
There's more at the link.
Counterfeit money that was blank on one side? Yeah, that'll fool 'em . . .